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JEE Main levelSingle correct optionDifficulty 2 of 3cb179

Which of the following chlorides has the lowest melting point?

A $MgCl X_{2}$
B $BaCl X_{2}$
C $BeCl X_{2}$
D $CaCl X_{2}$

Answer: C

On descending Group

2

the cation grows larger, its polarising power drops and the chloride becomes more ionic with a higher melting point.

Be X^{2 +}

is the smallest, so

BeCl X_{2}

is the most covalent (about

40 0^{\circ} C

) while

BaCl X_{2}

melts near

96 0^{\circ} C

.

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